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authorChris Wilson <chris@chris-wilson.co.uk>2010-10-20 20:59:57 +0100
committerChris Wilson <chris@chris-wilson.co.uk>2010-10-20 21:06:34 +0100
commitb5dc608c98d929abbf2fe932ed07b3c868d83342 (patch)
tree856fe6ba9133fe9b3019ff578fb808aa79027a9f /drivers/gpu/drm
parent69dc4987cbe5fe70ae1c2a08906d431d53cdd242 (diff)
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drm/i915: Copy the updated reloc->presumed_offset back to the user
If the userspace driver is using a constant relocation array with a static buffer, they will pass the same relocation array back to the kernel. So we *do* need to update the presumed offset value in those relocations to reflect the current object so that they remain correct with future batchbuffers and we avoid the necessity of having to suspend execution and perform redundant relocations. Fixes the regression introduced by 12f889c for applications using absolute addressing on trees of buffer (i.e. the current consumers of libdrm_intel.so). Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=30996 Reported-by: Wang, Jinjin <jinjin.wang@intel.com> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'drivers/gpu/drm')
-rw-r--r--drivers/gpu/drm/i915/i915_gem.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 6e85496f916..5041ebe3fdf 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3399,6 +3399,15 @@ i915_gem_execbuffer_relocate(struct drm_i915_gem_object *obj,
iowrite32(reloc.delta, reloc_entry);
io_mapping_unmap_atomic(reloc_page, KM_USER0);
}
+
+ /* and update the user's relocation entry */
+ reloc.presumed_offset = target_offset;
+ if (__copy_to_user_inatomic(&user_relocs[i].presumed_offset,
+ &reloc.presumed_offset,
+ sizeof(reloc.presumed_offset))) {
+ ret = -EFAULT;
+ break;
+ }
}
drm_gem_object_unreference(target_obj);
@@ -3560,6 +3569,10 @@ validate_exec_list(struct drm_i915_gem_exec_object2 *exec,
if (!access_ok(VERIFY_READ, ptr, length))
return -EFAULT;
+ /* we may also need to update the presumed offsets */
+ if (!access_ok(VERIFY_WRITE, ptr, length))
+ return -EFAULT;
+
if (fault_in_pages_readable(ptr, length))
return -EFAULT;
}